CN210129779U

CN210129779U - Hub motor of electric vehicle

Info

Publication number: CN210129779U
Application number: CN201921177468.2U
Authority: CN
Inventors: 陈静
Original assignee: 张维
Current assignee: Qin Xiaoyang
Priority date: 2019-07-24
Filing date: 2019-07-24
Publication date: 2020-03-06
Anticipated expiration: 2029-07-24

Abstract

The utility model provides an electric motor car in-wheel motor belongs to the motor field. The electric vehicle hub motor comprises a stator assembly and a rotor assembly, wherein the rotor assembly comprises a wheel hub, the wheel hub comprises a magnetic conduction ring and a wheel rim sleeved outside the magnetic conduction ring, the wheel hub is provided with a first side cover and a second side cover, and the first side cover and the second side cover are connected through the magnetic conduction ring. The utility model has the advantages of low cost and the like.

Description

Hub motor of electric vehicle

Technical Field

The utility model belongs to the motor field, in particular to electric motor car in-wheel motor.

Background

The driving force of the hub motor depends on the outer diameter of the stator to a great extent, and the magnitude of the driving force directly influences the acceleration, the overload capacity, the climbing capacity and other key performances of the vehicle. Because the performance demand of end user to the electric motor car is higher and higher to demands such as adaptation different road conditions, loading capacity, reliability, and end user increases to experience sexual function's such as acceleration requirement, all needs wheel hub motor to increase its drive power, otherwise burns out wheel hub motor because of the temperature rise is too high easily.

The common practice in the industry at present is to increase the driving force by increasing the thickness of the stator stack, but the axial installation size of the vehicle limits the thickness of the stator stack, and the increase of the thickness of the stator stack is very large, which ultimately affects the overall cost of the electric vehicle. The size of the outer diameter of the stator is limited by the nominal diameter of the wheel rim, and cannot be increased freely. The energy consumption of the vehicle is in direct proportion to the weight, and the driving range of the electric vehicle can be increased by reducing the weight

The existing iron hub motor shell of the electric vehicle is formed by combining a hub and end covers, the hub is generally formed by sleeving a rim into a magnetic conduction ring with the wall thickness of more than 6.5mm and then welding, and two side covers are connected with the magnetic conduction ring in a screw locking mode, wherein the weight of the magnetic conduction ring is more than 1.2Kg and accounts for more than 40 percent of the total weight of the shell. The rim and the side cover are used as supporting structural parts, the weight is difficult to reduce, the wall thickness of the magnetic conduction ring is far higher than the strength requirement, only for the requirement of locking a screw, the wall thickness must be larger than the outer diameter (4mm) of the screw, and meanwhile, the width (1.5mm) of the sealing rubber strip and the minimum thickness (1mm) of the threaded hole and the outer diameter are reserved, so that the thickness is increased. If the function of the locking screw and the sealing function can be kept, the wall thickness of the magnetic conduction ring is reduced, the space of an internal motor can be increased to improve power, and meanwhile, the weight and the material cost can be reduced.

In summary, under the condition of the same nominal diameter of the hub, how to reduce the wall thickness of the magnetic conductive ring to the maximum extent so as to increase the size of the outer diameter of the stator is a major technical difficulty in reducing the cost of the hub motor, reducing the weight of the motor and improving the power of the motor.

Disclosure of Invention

The utility model aims at providing an electric motor car in-wheel motor to the above-mentioned problem that exists among the prior art.

The purpose of the utility model can be realized by the following technical proposal: the utility model provides an electric motor car in-wheel motor, its characterized in that includes stator assembly and rotor assembly, rotor assembly include wheel hub, wheel hub include that magnetic ring and cover establish the outside rim of magnetic ring, wheel hub be provided with first limit lid and second limit lid, first limit lid and second limit lid between connect through magnetic ring.

In foretell electric motor car in-wheel motor, magnetic ring one end be provided with the internal connection portion that is located the magnetic ring inboard, the magnetic ring other end be provided with the external connection portion that is located the magnetic ring outside, first side cover pass through connecting piece and internal connection portion and connect, the second side cover pass through connecting piece and external connection portion and connect.

In the above hub motor for the electric vehicle, the thickness of the magnetic conductive ring is 1-4 mm.

In the above-mentioned electric motor car in-wheel motor, the cross section of magnetic conduction ring is "Z" type.

In the above-mentioned electric motor car wheel hub motor, the permanent magnet is fixedly connected on the inner wall of magnetic conduction ring.

In the above-mentioned electric motor car in-wheel motor, the stator assembly including install the axle on electric vehicle and be fixed in epaxial stator core, stator core be provided with the coil winding of coiling on stator core.

In the electric vehicle hub motor, the first side cover and the second side cover are connected through a bearing and a shaft, and the first side cover is smaller than the second side cover.

In the foregoing wheel hub motor for an electric vehicle, the stator assembly further includes a lead for leading the coil winding out of the motor, and a sensor for detecting a position of the rotor assembly.

In foretell electric motor car in-wheel motor, the connecting piece be the screw, inner connecting portion and outer connecting portion all be provided with a plurality of screw holes, the screw hole inner wall be provided with the screw thread, first side lid insert the screw hole through the screw in with inner connecting portion locking connection, with second side lid insert the screw hole through the screw in with outer connecting portion locking connection.

In the above-mentioned electric vehicle wheel hub motor, the screw hole is a through hole, a joint surface of the first side cover and the magnetic conductive ring is provided with a sealing rubber strip, and a joint surface of the second side cover and the magnetic conductive ring is provided with a sealing rubber strip.

In foretell electric motor car in-wheel motor, the connecting piece be the screw, inner connecting portion and outer connecting portion all linked firmly the reinforcing block, inner connecting portion and reinforcing block seted up the screw hole, outer connecting portion and reinforcing block seted up the screw hole, the screw hole inner wall be provided with the screw thread, first side cover insert in the screw hole through the screw and lead magnetic ring lock joint, the second side cover insert in the screw hole through the screw and lead magnetic ring lock joint.

Compared with the prior art, the utility model has the advantages of it is following:

1. the utility model discloses a magnetic conduction ring one end is located inboard in-connection portion of magnetic conduction ring and passes through the connecting piece and connect with first side cover, the outer joint portion that the magnetic conduction ring other end is located the magnetic conduction ring outside passes through the connecting piece and the second side cover is connected, because the existence of outer joint portion and in-connection portion, because first side cover and in-connection portion are connected again, second side cover and outer joint portion are connected, and outer joint portion and in-connection portion are located the both ends of magnetic conduction ring, make the reduction that the thickness of the magnetic conduction ring between in-connection portion and the outer joint portion can be great, thereby the weight of magnetic conduction ring has been reduced, and because the reduction of magnetic conduction ring thickness, the outer diameter of stator assembly has been increased, thereby motor weight has been alleviateed, in-wheel.

2. The cross section of the magnetic conduction ring of the utility model is Z-shaped. The stator assembly comprises a shaft arranged on the electric vehicle and a stator core fixed on the shaft, and the stator core is provided with a coil winding wound on the stator core. The 'Z' -shaped magnetic conduction ring is adopted, the thickness and the weight of the magnetic conduction ring exceed 1/3 of the original state, the size of the outer diameter of the stator core is increased by 2.5-5.5 mm under the condition that other conditions are not changed, the magnetic circuit design of the motor can be more reasonably optimized, the driving force of the motor is effectively increased under the condition that the thickness of the stator core of the motor is equal to the thickness of the stator core of the motor, the phenomenon that the driving force is insufficient due to the fact that the thickness of the stator core of the motor cannot be increased is avoided, and the service life of. Meanwhile, due to the fact that the outer diameter of the motor stator iron core is increased, power density is correspondingly increased, and material cost can be effectively reduced under the same power requirement.

Drawings

Fig. 1 is a schematic sectional view of the present invention;

FIG. 2 is a schematic cross-sectional view of the magnetic conductive ring of the present invention;

FIG. 3 is a schematic cross-sectional view of a second embodiment of an inner connecting portion and an outer connecting portion of the present invention;

fig. 4 is a schematic cross-sectional view of one embodiment of the inner and outer connecting portions of the present invention.

In the figure, 1, a stator assembly; 2. a rotor assembly; 3. a hub; 4. a magnetic conductive ring; 5. a rim; 6. a first side cover; 7. a second side cover; 8. an inner connection portion; 9. an outer connecting portion; 10. a connecting member; 11. a permanent magnet; 12. a stator core; 13. a coil winding; 14. a shaft; 15. a bearing; 16. a sensor; 17. screw holes; 18. a thread; 19. sealing rubber strips; 20. an iron core support; 21. a bushing; 22. a wire; 23. and a reinforcing block.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1-4, an electric vehicle hub motor includes a stator assembly 1 and a rotor assembly 2, the rotor assembly 2 includes a hub 3, the hub 3 includes a magnetic conductive ring 4 and a rim 5 sleeved outside the magnetic conductive ring 4, the hub 3 is provided with a first side cover 6 and a second side cover 7, and the first side cover 6 and the second side cover 7 are connected through the magnetic conductive ring 4.

In a detailed description, one end of the magnetic conductive ring 4 is provided with an inner connecting portion 8 located on the inner side of the magnetic conductive ring 4, the other end of the magnetic conductive ring 4 is provided with an outer connecting portion 9 located on the outer side of the magnetic conductive ring 4, the first side cover 6 is connected with the inner connecting portion 8 through a connecting piece 10, and the second side cover 7 is connected with the outer connecting portion 9 through a connecting piece 10. The rim 5 is sleeved in the magnetic conduction ring 4 and then welded into the hub 3.

In more detail, the cross section of the magnetic conductive ring 4 is in a Z shape. The stator assembly 1 includes a shaft 14 mounted on the electric vehicle and a stator core 12 fixed to the shaft 14, and the stator core 12 is provided with a coil winding 13 wound around the stator core 12. The 'Z' -shaped magnetic conductive ring 4 is adopted, the thickness and weight of the magnetic conductive ring 4 are reduced to exceed 1/3 of the original state, under the condition that other conditions are unchanged, the outer diameter size of the stator core 12 is increased by 2.5-5.5 mm, the magnetic circuit design of the motor can be optimized more reasonably, the driving force of the motor is effectively increased under the condition that the same stator core 12 is thick, the phenomenon that the driving force is insufficient due to the fact that the stacking thickness of the stator core 12 of the motor cannot be increased is avoided, and the service life of the motor is prolonged. Meanwhile, as the outer diameter of the motor stator iron core 12 is increased, the power density is correspondingly increased, and the material cost can be effectively reduced under the same power requirement. The stator core 12 is fixed to the shaft 14 by knurling or keying and is slotted by multiples of 3. In order to save the consumption of silicon steel sheets and reduce the cost and resource consumption, the inner side of the stator core 12 can be hollow, and an iron core bracket 20 and a lining 21 are added.

In more detail, the inner wall of the magnetic conduction ring 4 is fixedly connected with a permanent magnet 11. Can be adhered by glue.

In more detail, the thickness of the magnetic conductive ring 4 is between 1mm and 4 mm. The first edge cover 6 and the second edge cover 7 are both connected with a shaft 14 through a bearing 15, and the first edge cover 6 is smaller than the second edge cover 7. The Z-shaped magnetic conductive ring 4 and the side covers with different sizes, the magnetic conductive ring 4 breaks through the limit that the wall thickness of the magnetic conductive ring 4 of the motor is not less than 6.5mm at present and can be less than 4mm, thereby achieving the purposes of improving the performance of the motor and reducing the weight and the material cost. The thickness of the Z-shaped magnetic conductive ring 4 is 1-4mm, and is less than or equal to the outer diameter of the screw.

In further detail, the stator assembly 1 further includes leads 22 for leading the coil windings 13 out of the motor and a sensor 16 for detecting the position of the rotor assembly 2. The sensor 16 is used to detect the position of the rotor assembly 2.

The inner connecting part 8 and the outer connecting part 9 have two embodiments

One embodiment is as follows: as shown in fig. 3, the connecting member 10 is a screw, the inner connecting portion 8 and the outer connecting portion 9 are both provided with a plurality of screw holes 17, the inner wall of each screw hole 17 is provided with a thread 18, the first side cover 6 is locked and connected with the inner connecting portion 8 by being inserted into the screw hole 17 through the screw, and is locked and connected with the outer connecting portion 9 by being inserted into the screw hole 17 through the screw, and the cross sections of the inner connecting portion 8 and the outer connecting portion 9 are both convex.

In more detail, the screw hole 17 is a through hole, a joint surface of the first edge cover 6 and the magnetic conductive ring 4 is provided with a sealing rubber strip 19, and a joint surface of the second edge cover 7 and the magnetic conductive ring 4 is provided with the sealing rubber strip 19. The waterproof performance of the hub 3 motor can be greatly improved, and the possibility of water inlet failure is greatly reduced.

In order to ensure the layout of the screw holes 17, one end of the magnetic conduction ring 4 is provided with a plane which is turned over towards the circular inner side, the screw holes 17 used for connecting the first side cover 6 are distributed on the plane to form an inner connecting part 8, the other end of the magnetic conduction ring 4 is provided with a plane which is turned over towards the circular outer side, the screw holes 17 used for connecting the second side cover 7 are distributed on the plane to form an outer connecting part 9.

Screw holes 17 on two sides of the Z-shaped magnetic conductive ring 4 can be directly processed on planes on two sides, and threads 18 can also be processed by punching flanging holes.

The second embodiment: if shown in fig. 4, the connecting piece 10 is a screw, the inner connecting portion 8 and the outer connecting portion 9 are fixedly connected with the reinforcing block 23, the inner connecting portion 8 and the reinforcing block 23 are provided with screw holes 17, the outer connecting portion 9 and the reinforcing block 23 are provided with screw holes 17, the inner wall of each screw hole 17 is provided with threads 18, the first side cover 6 is inserted into the screw holes 17 through the screws and is in locking connection with the magnetic conduction rings 4, and the second side cover 7 is inserted into the screw holes 17 through the screws and is in locking connection with the magnetic conduction rings 4. The reinforcing block can be installed on the magnetic conduction ring 4 by crimping, welding, riveting, bonding and the like, and then a through hole is processed between the reinforcing block and the inner connecting part or the outer connecting part to form a screw hole 17.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the stator assembly 1, the rotor assembly 2, the hub 3, the magnetic conductive ring 4, the rim 5, the first side cover 6, the second side cover 7, the inner connecting portion 8, the outer connecting portion 9, the connecting member 10, the permanent magnet 11, the stator core 12, the coil winding 13, the shaft 14, and the bearing 15 are more used herein; sensor 16, screw holes 17, thread 18, sealing rubber strip 19, core support 20, bushing 21, wire 22, reinforcing block 23, etc., without excluding the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides an electric motor car wheel hub motor, its characterized in that includes stator assembly (1) and rotor assembly (2), rotor assembly (2) including wheel hub (3), wheel hub (3) including magnetic conduction ring (4) and cover establish rim (5) outside magnetic conduction ring (4), wheel hub (3) be provided with first limit lid (6) and second limit lid (7), first limit lid (6) and second limit lid (7) between connect through magnetic conduction ring (4).

2. The electric vehicle hub motor according to claim 1, wherein one end of the magnetic conduction ring (4) is provided with an inner connecting part (8) positioned on the inner side of the magnetic conduction ring (4), the other end of the magnetic conduction ring (4) is provided with an outer connecting part (9) positioned on the outer side of the magnetic conduction ring (4), the first side cover (6) is connected with the inner connecting part (8) through a connecting piece (10), and the second side cover (7) is connected with the outer connecting part (9) through the connecting piece (10).

3. The hub motor of the electric vehicle as claimed in claim 1, wherein the cross section of the magnetic conductive ring (4) is Z-shaped, and the thickness of the magnetic conductive ring (4) is between 1 and 4 mm.

4. The hub motor of the electric vehicle as claimed in claim 1, wherein the inner wall of the magnetic conductive ring (4) is fixedly connected with a permanent magnet (11).

5. The in-wheel motor of the electric vehicle as claimed in claim 1, wherein the stator assembly (1) comprises a shaft (14) mounted on the electric vehicle and a stator core (12) fixed on the shaft (14), and the stator core (12) is provided with a coil winding (13) wound on the stator core (12).

6. An electric vehicle in-wheel motor according to claim 5, characterized in that the first side cover (6) and the second side cover (7) are connected with the shaft (14) through a bearing (15), and the first side cover (6) is smaller than the second side cover (7).

7. An in-wheel motor for electric vehicles as claimed in claim 5, wherein said stator assembly (1) further comprises wires (22) for leading the coil windings (13) out of the motor and a sensor (16) for detecting the position of the rotor assembly (2).

8. The electric vehicle hub motor of claim 2, wherein the connecting member (10) is a screw, the inner connecting portion (8) and the outer connecting portion (9) are provided with a plurality of screw holes (17), the inner wall of each screw hole (17) is provided with a thread (18), the first side cover (6) is inserted into the screw holes (17) through the screws and is in locking connection with the inner connecting portion (8), the second side cover (7) is inserted into the screw holes (17) through the screws and is in locking connection with the outer connecting portion (9), and the cross sections of the inner connecting portion (8) and the outer connecting portion (9) are convex.

9. The hub motor of the electric vehicle as claimed in claim 8, wherein the screw hole (17) is a through hole, a sealing rubber strip (19) is arranged at the joint surface of the first side cover (6) and the magnetic conductive ring (4), and a sealing rubber strip (19) is arranged at the joint surface of the second side cover (7) and the magnetic conductive ring (4).

10. The electric vehicle hub motor of claim 9, wherein the connecting member (10) is a screw, the inner connecting portion (8) and the outer connecting portion (9) are fixedly connected with the reinforcing block (23), the inner connecting portion (8) and the reinforcing block (23) are provided with screw holes (17), the outer connecting portion (9) and the reinforcing block (23) are provided with screw holes (17), the inner wall of each screw hole (17) is provided with a thread (18), the first side cover (6) is inserted into the screw holes (17) through the screw and is in locking connection with the magnetic conduction rings (4), and the second side cover (7) is inserted into the screw holes (17) through the screw and is in locking connection with the magnetic conduction rings (4).